Brake



ApriI 10,1934. R. A. GOEPFRICH 1,954,524

BRAKE Original Filed July 26, 1929 34 INVENTORY k 5+ EUDOLPHHGaEPFe/M F g- 4 W A TTORNEK Patented Apr. 10, 1934 PATENT BRAKE Rudolph A. Goepfrich, South Bend; Ind, assignor to Bendix Aviation Corporation, Southhend, Ind, a corporation of Delaware Driginal application July 26, 1929, Serial No.

$1,122.. Divided and this application December ill, wi l, Serial No. sealer @liiJi llllilEh (ill;

This invention relates to brakes and more par ticularly to the friction elements thereof.

Broadly, the invention comprehends a friction element for an internal expanding bralre including a rim and a web supporting the rim. The rim has spaced embossments protruding from the under side thereof and the web has correspondingly shaped spaced recesses on its periphery for the reception of the embossments, and certain of the embossments are slotted longitudinally to receive the uninterrupted peripheral surface of the web. Because of this particular structure relative longitudinal and lateral movements between the web and the rim are avoided.

An object of the invention is to provide a friction element having parts locked against relative longitudinal and lateral movement.

Another object of the invention is to provide a brake shoe includinga rim having spaced protrusions some of which are slotted longitudinally to receive a web having recesses for the reception of the other protrusions, to effectively prevent relative longitudinal and lateral movements.

A feature of the invention is a brake shoe including a rim having protrusions and a web sup= porting the rim having recesses receiving the protrusions. 7

Another feature of the invention is a brake shoe including a rim having protrusions, some of which are slotted on the longitudinal axis of the rim, and a web having its uninterrupted periphery extending through slots and recesses receiving the other protrusions.

Other objects and features of the invention will appear from the following description taken in connection with the drawing which forms a part of this specification, and in which:

Figure 1 is a vertical section of a brake taken just back of the head of the drum showing the friction elements in side elevation and illustrating the invention as applied;

Figure 2 is a sectional view substantially on the line 22, Figure 1;

Figure 3 is a sectional view substantially on line 33, Figure 2;

Figure 4 is a sectional view substantially on line 4-4, Figure 1; and

Figure 5 is a sectional view substantially on line 5-5, Figure 4.

Referring to the drawing for more specific details of the invention, 10 represents a fixed sup- .port such as a backing plate. The backing plate has associated therewith a rotatable drum 12 which may be secured to a wheel not shown. The backing plate has thereon anchors 14 and 16 and positioned for rotation on the backing plate an operating lever 18 suitably connected to an op erating means, not shown. The lever has pivoted thereon a floating cam 20 for spreading the fric tion elements into drum engagement.

The friction elements include a primary shoe 22 and a secondary shoe 24. The primary shoe 22 is anchored on the anchor lei-and the secondary shoe is anchored on the anchor 16. The shoes are connected at their articulated ends by a suitable adjusting device 26 and the separable ends of the shoes engage the floating cam lever 20.

The primary shoe 22 and the secondary shoe 24 are connected by a return spring 28 and the primary shoe 22 is connected by an auxiliary return spring 30 to a fixed support 32. These springs serve to return the shoes to the 0d position upon release of the brake, and to retain them,

in this position in proper spaced relation to the drum.

As shown, the primary and secondary shoes are interchangeable. Each of the shoes includes a web 34 supporting a rim 36 to which is suitably secured a lining 38 adaptable for cooperation with the braking surface of the drum. The rim is provided with spaced embossments to protruding from the under side thereof. These ensbossments fit snugly in correspondingly shaped recesses 42 in the peripheral face of the web.

The embossments to are alternately slotted as indicated at it to accommodate the uninterrupted peripheral face of the web. Because of the interlocking of the web with the rim due to the protrusion 40 fitting snugly in the recess 42, relative longitudinal movement between the rim and the web is avoided. Likewise because of the interlocking of the uninterrupted peripheral surface of the rim with the slotted protrusions, relative lateral movement of the rim and the web is avoided. Upon assembly of the rim and web these parts are secured together by spot-welding or other suitable means.

This application is a division of my pending application Serial No. 381,122, filed July 26, 1929, and is made in accordance with requirements of the United States Patent Oflice under provision of Rule 42.

It is to be understood that the form of the invention herein shown and described is to be taken as a. preferred example of the same and that various changes in shape, size and arrangement of parts may be resorted to without departing from the spirit of the invention or the scope of the subjoined claims. 1

Having thus described the various features of es-sees 3. A brake shoe comprising a rim having spewed embossments, the embossments being alternately slotted, and eweb seated in the slotted embossments having recesses for the reception of other embossments.

4. A brake shoe comprising a rim having spaced bosses arranged in the longitudinal axis of the rim, the bosses being alternately slotted 1ongi= tudinally, and a. web 'for supporting the rim hav= ing a peripheral face extending through the slotted embossments and recesses for the reception of the other bosses.

RUDOLPH A. GOEPFRICH. 

